Cypress Semiconductor Corporation

Interdigital Patent Holdings, Inc.

Interdigital Technology Corporation

Yan Li

Kamesh Medapalli

Marian Rudolf

Hongwei Kong

Christopher R Cave

Stephen G Dick

Prabhakar Chitrapu

Behrouz Aghili

Jie Lai

Guodong Zhang

Afshin Haghighat

Paul Marinier

Diana Pani

Ghyslain Pelletier

Benoit Pelletier

Pascal M Adjakple

Allan Yingming Tsai

J Patrick Tooher

Fengjun Xi

Lujing Cai

Kiran Uln

Yingxue K Li

Hong O Zhang

James Wihardja

Pouria Zand

Khushali N Manseta

Patrick Cruise

Yanbing Zhang

Wendy Yu

Kai Xie

David Gordon Wright

Philip J Pietraski

Robert W Zopf

Victor Simileysky

Philip J Pietrazki

Implementations disclosed describe techniques and systems that improve wireless connectivity between devices that support multiple operation modes, by monitoring a quality of the established wireless connection and performing a change of the operation mode in response to changing conditions. The disclosed techniques include obtaining metrics characterizing quality of the wireless connection, identifying a utility function that is specific to an application supported by the wireless connection, computing multiple values of the utility function for various operation modes, based on the obtained metrics, and initiating a change of the operation mode based on a comparison of the computed utility values.

Adaptive wireless connections in multi-mode devices

Disclosed are techniques to compensate frequency systematic known error (FSKE) in reflector or initiator radios using a hybrid RF-digital approach in multi-carrier phase-based ranging. The hybrid RF-digital approach combines a coarse frequency compensation technique in the RF domain and a fine frequency compensation technique in the digital domain to remove the FSKE across all carrier frequencies from a device. The coarse frequency compensation performed in the RF domain may use a PLL to multiply the crystal frequency to arrive close to a target carrier frequency to compensate for a coarse portion of the known FSKE at the target frequency. The fine frequency compensation may use digital techniques to remove the remaining portion of the known FSKE not compensated by the RF. The hybrid approach reduces the number of fractional bits in the multiplier of the PLL when compared to an approach that uses only the RF-PLL to remove the FSKE.

Coarse and fine compensation for frequency error

Embodiments contemplate methods and systems for determining and communicating channel state information (CSI) for one or more transmission points (or CSI reference signal resources). Embodiments further contemplate determining transmission states may include applying at least one transmission state parameter to channel state information (CSI). Embodiments also contemplate reporting CSI based on the transmission state and/or at least one transmission state parameter applied thereto.

Communicating channel state information (CSI) of multiple transmission points

A system and method for an efficient secure phase-based ranging using loopback calibration, including receiving, by a reflector during a current timeslot, an incoming constant tone (CT) signal having a phase shift; determining, by the reflector during the current timeslot or a previous timeslot, a phase shift correction value by using a receiver/transmitter (Rx/Tx) loopback path of the reflector; and/or generating, by the reflector, an outgoing CT signal having an updated phase shift by adjusting the phase shift of the incoming CT signal based on the phase shift correction value.

Efficient secure phase-based ranging using loopback calibration

Systems, methods, and devices shape waveforms associated with transmission of data from wireless communications devices. Methods may include identifying, using a processing device, a plurality of portions of a Bluetooth packet for transmission from a wireless communications device, the plurality of portions comprising a first portion and a second portion. Methods may also include determining, using the processing device, a first transmit power associated with the first portion and a second transmit power associated with the second portion, the determining being based, at least in part, on whether the first portion or second portion is used in packet detection. Methods may further include transmitting the first portion of the Bluetooth packet using the first transmit power, and transmitting the second portion of the Bluetooth packet using the second transmit power.

Transmit waveform shaping for wireless communications devices

Calibrating a Gaussian frequency-shift keying modulation index includes generating a training sequence of bits, shaping a pulse from the training sequence according to an initial modulation index, and converting the shaped signal to a transmission signal. The transmission signal is then either looped through a radio frequency core or processed by frequency deviation estimation hardware to determine a frequency deviation. The frequency deviation is converted to a new modulation index, and potentially a ratio between a target modulation index and a measured modulation index as a scaling factor. The process is then iteratively repeated until a threshold frequency deviation is achieved.

Stable modulation index calibration and dynamic control

A communication system and method are disclosed for parallel processing of received signals to improve sensitivity of the system. Generally, the method includes demodulating a modulated signal in a first demodulator circuit and a second demodulator circuit in parallel. The first and second demodulated signals are then de-whitened, and a cyclic redundancy code (CRC) check performed on each. If the de-whitened first demodulated signal passes the CRC check a first packet included in the signal is sent to a central processing unit (CPU) for further processing. If the de-whitened second demodulated signal passes the CRC check, and the de-whitened first demodulated signal fails, a second packet included in the de-whitened second demodulated signal is transmitted to the CPU for further processing. In one embodiment, one of demodulator circuits is a GFSK demodulator operated in the phase domain and configured to use maximum likelihood sequence estimation. Other embodiments are also described.

Parallel processing of dirty packets in Bluetooth and Bluetooth low energy systems

A modem includes a modulator and a demodulator. The demodulator includes a direct current removing (DCR) circuit to transition between an acquisition mode, where the DCR circuit operates with a first loop gain; and a tracking mode, where the DCR circuit operates with a second loop gain. The second loop gain is smaller than the first loop gain, and the timing of the transition between the acquisition mode and tracking mode is programmable.

Spur cancellation system for modems

A frequency-shift keying (FSK) demodulator includes a digital phase-locked loop (DPLL) based frequency estimator to convert a phase signal to a frequency signal, a frequency offset estimator to estimate and track direct current (DC) component of the frequency signal, and an average filter communicatively coupled to the frequency offset estimator to perform an accumulate-and-dump operation to improve a symbol-level signal to noise ratio (SNR) of the frequency signal.

Frequency estimation, correction and noise suppression for modems

Feedback information for multiple serving cells are transmitted on high speed dedicated physical control channel (HS-DPCCH). A slot format for transmitting feedback information is determined based on the number of configured secondary serving cells and whether multiple input multiple-output (MIMO) is configured in the serving cells. Spreading factor is reduced to 128 when two secondary serving cells are configured and MIMO is configured in at least one of the two configured secondary serving cells, or when three secondary serving cells are configured. The serving cells are grouped into feedback groups, each feedback group having one or more serving cells. Channel coding may be applied to feedback information for the feedback groups. The resulting encoded feedback information for the feedback groups is concatenated to form composite feedback information.

Sending feedback for multiple downlink carriers

Disclosed herein are systems and methods for long-term feedback transmitting and rank reporting. According to an aspect, a method of feedback reporting may be implemented at a WTRU. The method may include determining a long-term precoder and a short-term precoder. The method may also include calculating channel quality index (CQI) based on the long-term precoder and the short-term precoder. Further, the method may include transmitting the CQI to a base station.

Long-term feedback transmission and rank reporting

A method and apparatus for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed. A PAN check sequence (PCS) is created, for example using a cyclic redundancy check (CRC) encoding. The PCS is masked with a temporary flow identity (TFI) assigned to a TBF or a mask generated based on the TFI. A data block including the PAN field and the masked PCS is then processed for transmission. The mask may be generated by converting the TFI using an (M, N) code, M being not greater than the number of bits of the PCS and N being the number of bits of the TFI. With this scheme, a TFI may be transmitted in a PAN field without using explicit bits to identify the TBF.

Method and apparatus for indicating a temporary block flow to which a piggybacked acknowledgement/non-acknowledgement field is addressed

A method and an apparatus for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed. A method and apparatus of performing receive processing to reduce the probability of false acceptance of erroneous PANs are also disclosed. A transmit station generates a PAN check sequence (PCS) and performs a channel coding on a PAN field and the PCS. The transmit station scrambles the encoded bits of the PAN field and the PCS with a TBF-specific scrambling code. Because of the scrambling, the PCS decoding at a receive station will pass if the data block is received by an intended receive station, while the PCS decoding will fail if received by a non-intended receive station. Alternatively, the scrambling may be performed before the channel coding. Alternatively, the transmit station may combine the PAN field and a temporary flow identity (TFI) to generate a PCS.

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Morganville, NJ, United States of America

Yan Li